// Copyright 2018 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

// Package authentication implements authentication mechanisms.
//
// Key Transparency is designed to be used by identity providers -
// IdP in OAuth parlance.  OAuth2 Access Tokens may be provided as
// authentication information, which can be resolved to user information and
// associated scopes on the backend.
package authentication

import "context"

// SecurityContext is the auth value stored in the Contexts.
type SecurityContext struct {
	Email string
}

// securityContextKey identifies SecurityContext within context.Context.
var securityContextKey struct{}

// FromContext returns a SecurityContext from the current context.
// ValidatedSecurity is inserted into ctx by AuthFunc.
func FromContext(ctx context.Context) (*SecurityContext, bool) {
	v, ok := ctx.Value(securityContextKey).(*SecurityContext)
	return v, ok
}
